This Simport Scientific biotube rack features easy-to-read numbers and letters on the box cover as well as support grids for enhanced convenience.This Simport Scientific biotube rack is made from high-quality plastic and can be used to hold 1.2 ml tubes. The blue rack can also be removed from the base of the box and can be used as a standalone rack that can be placed on a lab counter. In a 12 x 8 array, it features 96 spaces for tubes with colored interchangeable plastic grids. The tubes can also be placed in a refrigerator, a freezer shelf or a water bath to allow controlled warming of the contents. This Simport Scientific biotube rack comes in a pack of 10 pieces.